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Inflammatory reactions in rheumatoid arthritis (RA) often cause severe joint destruction. However, the mechanism of bone destruction is still a matter of controversy. To determine whether multinuclear cells found in the rheumatoid synovium can resorb bone, isolated synovial cells were assessed for tartrate-resistant acid phosphatase (TRAP) staining and the ability to resorb bone in a dentine resorption assay. TRAP-positive multinuclear cells were found in six out of 10 samples. These six samples showed resorption pit formation on dentine slices. The other four samples did not form resorption pits. The results of this study demonstrate that TRAP-positive multinuclear cells isolated from the rheumatoid synovium form resorption pits on dentine slices. Our results suggest that inflamed synovial cells in rheumatoid joints might participate in bone destruction.

BONE RESORPTION BY TARTRATE-RESISTANT ACID PHOSPHATASE-POSITIVE MULTINUCLEAR CELLS ISOLATED FROM RHEUMATOID SYNOVIUM